| Praseodymium |
|
59Pr
|
|
|
| Ìhànsójú |
grayish white
 |
| Àwọn ìdámọ́ wíwọ́pọ̀ |
| Orúkọ, àmì-ìdámọ́, nọ́mbà |
praseodymium, Pr, 59 |
| Ẹ̀ka ẹ́límẹ̀nti |
lanthanide |
| Ẹgbẹ́, àsìkò, àdìpò |
n/a, 6, f |
| Ìwúwo átọ́mù |
140.90765 |
| Ìtòléra ẹ̀lẹ́ktrónì |
[Xe] 4f3 6s2
2, 8, 18, 21, 8, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
6.77 g·cm−3 |
| Liquid density at m.p. |
6.50 g·cm−3 |
| Melting point |
1208 K, 935 °C, 1715 °F |
| Boiling point |
3793 K, 3520 °C, 6368 °F |
| Heat of fusion |
6.89 kJ·mol−1 |
| Heat of vaporization |
331 kJ·mol−1 |
| Molar heat capacity |
27.20 J·mol−1·K−1 |
| Vapor pressure |
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
1771 |
1973 |
(2227) |
(2571) |
(3054) |
(3779) |
|
| Atomic properties |
| Oxidation states |
4, 3, 2 (mildly basic oxide) |
| Electronegativity |
1.13 (Pauling scale) |
| Ionization energies |
1st: 527 kJ·mol−1 |
| 2nd: 1020 kJ·mol−1 |
| 3rd: 2086 kJ·mol−1 |
| Atomic radius |
182 pm |
| Covalent radius |
203±7 pm |
| Miscellanea |
| Crystal structure |
hexagonal
|
| Magnetic ordering |
paramagnetic [1] |
| Electrical resistivity |
(r.t.) (α, poly)
0.700 µΩ·m |
| Thermal conductivity |
12.5 W·m−1·K−1 |
| Thermal expansion |
(r.t.) (α, poly) 6.7 µm/(m·K) |
| Speed of sound (thin rod) |
(20 °C) 2280 m·s−1 |
| Young's modulus |
(α form) 37.3 GPa |
| Shear modulus |
(α form) 14.8 GPa |
| Bulk modulus |
(α form) 28.8 GPa |
| Poisson ratio |
(α form) 0.281 |
| Vickers hardness |
400 MPa |
| Brinell hardness |
481 MPa |
| CAS registry number |
7440-10-0 |
| Àwọn ísótòpù dídúró jùlọ |
| Main article: Àwọn ísótòpù praseodymium |
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· r |
Praseodymium (pípè /ˌpreɪzi.ɵˈdɪmiəm/ PRAY-zee-o-DIM-ee-əm tabi /ˌpreɪsi.ɵˈdɪmiəm/ PRAY-see-o-DIM-ee-əm) je apilese kemika to ni ami-idamo Pr ati nomba atomu 59.
